366/454 Commercial Engines?

I have a chance to get some low milage 366/454 Engines from Tree Trimming Trucks. They are Chevy and GMCs with what appears to be a 366 ci Big Block and 454 ci Big Blocks. Is there anywhere that has some information and specs on the 366 commercial engine? I am just curious to how much power/torque they make and any aftermarket support. Thanks in advance!
1987 Monte Carlo SS- Pro Street (one day)1987 Buick Regal- The Soon To Be Built Daily Driver1984 Chevy Caprice- All Stock F41/G80 Old Lady Owned Caprice.Mr. G-Body

At one time there was also a 427. These are tall deck engines with small bore/ long stroke so don't expect high rpm. Remember, they are truck engines. Pop an air cleaner off and have a look. Most of the older ones came with Holley carbs. There didn't use to be any aftermaket support for these way back when. There may be more support now. With the tall deck maybe you could build a big cube stroker? Might be a good one for Jeff to tackle...

I don't have the stock power ratings because they are horridly low and probably don't apply to the engines today or even matter...

I can say the 366 is a pretty poor power producer. It's the 305 of big block engines. I've heard horror stories of people using roots blowers and nitrous with those three ring pistons and making big power but that's not a very durable, long-term, and efficient power producer.

The tall-deck 'feature' is very difficult to use for a high rpm engine as the stroke can long outpace the bore, making a poor bore to stroke ratio and making high-end horsepower more difficult.

Aftermarket support is probably there since so many Chevy parts interchange. Some things will be limited because of the change needed for tall-deck engines but you can still find stock-replacement or sightly warmed over aftermarket parts I'm sure...
~Gibs

All the truck specific big blocks were designed for low RPM, monster torque to move stuff like dump trucks and school busses, so stock the high RPm potential isn't great. BUT, for a show car/street car, with some basic upgrades, they make great tire smokers. While the bore's are small, I believe they used the same crank journals as the regular Mark IV engines, and depending on how much meat is in the cylinder walls, you could always give it a serious overbore and allow it to rev better. And if the journals are the same, those super long stroke cranks would be great for sutffing in a normal Mark IV block to build a monster stroker engine.

I'd say grab them, at the least, you'd be able to find some boat guys who'd probably be interested in buying them, low rpm , monster torque, great for marine use.

Prostock1: You Like? I would like to see one built to stay under 5000rpm with ovalports and show how important torque is.My guess is 600-700 lbs at or below 3000rpm? Would anybody else like to see this built from CarCraft or is it not worth it? WIEDER

A 496 with 600lbs has happened at 3000rpm,"The Howitzer" build from PHR 597lbs at 3100 rpm and flat all the way to 5300rpm with peak at 635@3800 rpm with RHS 320cc and Comp Big Mutha roller with 243int./257exh..Less head,less cam and a 1/4" more stroke,that's getting closer to a diesel? Also I forgot to mention,the General didn't make 454 talls. I would like to see more user replies on this 525 combo and get other user's points maybe I'm not seeing. WIEDER

i ran a 427 truck block in a 73 bel air for a year or so like was said earlier the thing would smoke tires till the cows came home with the factory hiway gearing it would still run 85 mph but sucked fuel too much to keep at it the engine was a 1969 427 ho truck block the numbers ran as a 370 hp engine no listing for torque. The engine is still alive and well in a 4x4 here its only ran in the mud races now but its still running strong with a cam and chain change a few years back that really woke the thing up. I only got rid off it cause it was so hard on gas

But have fun trying to get those massive (relatively speaking) BBC ports to put out this kind of torque.
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CSIROC:This is true for a 455cu,but you have to remember that the intake port size ratio of these 455's compared to a BBC are smaller.If you could put a 210cc on BBC 454 I would think it would be close and that goes for a Chrysler 440 that also has small ports and shorter stroke but can still put out strong lowend torque.The ratio is starting to look better on a 525 BBC with 270cc ports,There's no denying the grunt these 455's put out in factory specs, also don't forget the Pontiac then you can say the BOP Torque engines.This was a good point to bring up. WIEDER